Yj 4.2 cold air intake - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ General Discussion Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 10-02-2019, 10:50 AM
Thread Starter
Julian Hayloxk's Avatar
Join Date: Oct 2015
Posts: 59
Yj 4.2 cold air intake

How needed is this tube for the 4.2 engines? My yj came without it and i never bothered to put one on. Would leaving it off be beneficial to having my air intake “higher” when off roading or does the added air flow from the grill help engine performance? Its a pain to remove and put back on when working on the engine.

Attached Thumbnails
Click image for larger version

Name:	8C8DB695-D654-4FED-9EDA-110A538063E9_1570031297881.jpeg
Views:	16
Size:	201.2 KB
ID:	4178105  
1988 Jeep yj. 4.2 I6
Julian Hayloxk is offline   Quote
Old 10-02-2019, 11:38 AM   #2
daddyjeep's Avatar
Join Date: Apr 2005
Location: Smethport, PA
Posts: 3,996
Man, it has been a long time since my engine bay looked like that. That hose will allow cooler, denser air to get into the engine which is certainly better than hot under hood air. Are you going to notice a difference in efficiency or power? Probably not.

87 YJ, 5.7/TH350/NP241, Custom 4 link/ Radius Arms, ADS Nitrogen Shocks, 35" Cooper STT
DaddyJeep build Thread:https://www.wranglerforum.com/f8/dad...ld-122601.html
daddyjeep is offline   Quote
Old 10-04-2019, 11:37 PM   #3
Gottagofast's Avatar
Join Date: May 2017
Posts: 7,643
I'd be more concerned with the broken manifold bolt

Edit nevermind that's not your jeep is it? Lol
I come in peace.... I mean you no harm
Currently in the stable: ... 97 tj 4.0 5 speed stock....04 tj 4.0 auto 4" and 33's... 98 tj roller for future build... 94 yj sahara 4.5" RE and 33's... 92 yj sbc 3/4 ton axles and 38's... Cj5,7,yj,xj,ex mud dragster project

TJ dash speakers that actually rock! Kicker sub and amp in center console
Gottagofast is offline   Quote
Sponsored Links
Old 10-05-2019, 01:44 PM   #4
Commercial Member
dvn4life1972's Avatar
Join Date: Jan 2014
Location: Caldwell, TX
Posts: 2,202
I had kept mine on the 4.2 while I still had that drivetrain. I don't think it operates effectively as any type of CAI, have ran it without for a while when I was dialing in the carb after rebuild. Might keep some debris and/or whatnot out of the breather...maybe.
dvn4life1972 is online now   Quote
Old 10-07-2019, 10:18 AM
Thread Starter
Julian Hayloxk's Avatar
Join Date: Oct 2015
Posts: 59
What im hearing is dont worry about it. Also no not my engine
1988 Jeep yj. 4.2 I6
Julian Hayloxk is offline   Quote
Old 10-07-2019, 11:51 PM   #6

WF Lifetime Member
WF Supporting Member
::WF Moderator::
Luckymac's Avatar
Join Date: Jan 2014
Location: SouthEast of Denver
Posts: 8,777
I try to keep everything at least looking stock. I bought a new one (it was missing when I bought the Jeep) just so it looked like it original.
Does it help with CIA or any performance? Well, the air coming in the tube might be a bit cooler than the underhood air but I doubt that it provides any measurable benefit other than making me feel good.

Good Luck, L.M.

"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
Luckymac is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 11:41 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.